Improvement in artificial slate



I06. COMPOSITIONS,

COATING OR PLASTIC.

Cross Reference e e-a1 DEIIIETRIUS M. STEWART), OF OING SOAP STONECOMPANY OF SAM-1i PL INNAT}, oi arq-mssicuon 110 ANCHOR IMPROVEM NT INRTIFICIAL ShAT-IE.

e I Specification forming part of Letters Pa vtent Not 211.113,datedJuly 22, l liliapplication filed To all 'whom it may concern:

Be it known that I,-DEMETRIUS M. Strung ARD, of Cincinnati, inthe'county of Hamilton and State of Ohio, have invented a new and usefulcompound, which I designate as Artificial Slate, and. which I propose toemploy in the manufacture of slate-pencils and other a1- -ticles.

The compound and the process of making a and using itare fully describedin the following specification. r The comfioundis composed of thefollowing substances, in about the proportions state-..; but the processof compoundingthem may be varied, although I "preferably employ thatwhich I am about to describe, as I have found that it produces verysatisfactory results. p l I first take about thirty (30 parts of finely-)ulverized slate fifteen (15) parts of 1 v sum, hm Wis of talc or v Mmix them together t wrong I After y vessel while in a dr condition. arethoroughly incorporated I add they to the mass about twenty-five (25)parts of cement or waterlass which acts as a flu; for e 0 er ingre- *1s, and again stir -the mass until-it is thoroughly mixed and in aplastic conditiom While in this state the compound may be molded, drawn,or otherwise shaped into the article which it is desired'to produce, andaf- May 9, 1879 terward dried ii1 'any convenient manner. As

.it dries it becomes hardened sufiiciently for use, an the article' inaythen be. considered as complete. It may, however, be polished, glazed,or painted, to impart a more complete and ornamental finishm V In makingslatepencils I prefer to mold them under pressure, so. that they shallbe hard and compact when dried. This may be done in avariety of ways,the essential requisite being that the pencils shall he even andstraight when completed.

Having thus described my invention, what I claim isl 1. A compoundconsisting of pulverized slate, gypsum, talc or talcosc earth, andcement or water-glass, substantially as described, for the purposesspecified. Y

2. As a new article of manufacture, a slatepencil composed of thefollowing ingredients, to wit: pulverized slate, gypsumfiitalg ortailcose earth and cemg-ntpr wa er-g ass, in en stantially theproportions specified.

In testimony of which invention I have hereunto set my hand this 26thday of April, A D.

DEMETRIUS M. STEWARD. Witnesses: I

' O. W. (1oLE,, E. A. ELLSWORTH.

